Piston-aligning machine for connecting-rod assemblies



Sept. 27,. 1927.

W. AAB

PISTON ALIGNING MACHINE FOR CONNECTING ROD ASSEMBLIES- I Original Filed Odt. 5. 1925 Patented Sept. 27, 1927.

entree STATES P ATE F F I WILLIAM AAB; OF NEW ULM, MINNESOTA: I

Piston-Antennae MACHINE non eoNnEorrNe-RonAssnMBLrEs.

Original application filed October 5, 1925;Seria1 No. 60,474. Divided and. this application filed Ap1i123, 1926. Serial No. 104,064.

My present invention has for its object to provide an extremely simple and" highly ef ficient piston aligning machine for connecting rod assemblies of internal combustion engines and is in the nature of a, division of my co-pending application entitled Aligning machine for connecting rods and wrist pins of internal combustion engines? filed October 5, 1925 under SerialNumberGOA'Tl. To the above end, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

In the accompanying drawings, which illustrate the invention',' like characters indicate like parts throughout the several views. Referring to the drawings:

Fig. 1 is a plan view of the machine having a connecting rod assembly mounted thereon; p Fig. 2 is a view partly'in' end. elevation and partly in transverse vertical section taken on the line 22 of Fig. 1'; and" Fig. 3 is a detail view in cross section taken onthe line 3-3-0f Fig. 1.

The numeral 3 indicates a flat base having at its back a longitudinally extended flange at suitably reinforced by means of cross ribs 5. The top of the base 3 is planed true to afford a piston-supporting surface 6. The base 3 may be rigidly held in any suitable manner, such as by having its depending flange 4 clamped between the jaws of a vise.- Formed with the base 3 at the left-hand end thereof is a fixed split bearing sleeve 7 having a turning-r0d-equipped adjusting screw 8 for contracting the same. The axis of this hearing sleeve 7 extends parallel to the piston-testing surface 6.

A piston-aligning member 9 in the form of a straight edge or blade is secured to a bracket 11 mounted on a shaft 12 secured in open seats formed in lugs 13 on the back of the base flange 4 by means of screws 14.-

shaft 12, whereby the bracket may beadjusted to support the piston aligning" memher ,9' horizontally over the piston-supportlng'surface 6. Friction between thebra'cke't 11 and shaft 12 and in the joint 15 issuch that said bracket will stay whereset. WVhen notin use the bracket 11 may be turned into position back'of the base 3 where the same will be'entirely out of the way. A

An arbor 16 is turnably mounted in the bearing sleeve 7 and has a forwardly projecting section 17 on which the crank" end of a connecting rod A and its bushing may be mounted. This arbor sectioirll' is-of a diameter that corresponds to the orankof the engine crank shaft for which the connecting rod A is designed.- Preferably the arbor section 17 will be flattened on four sides so that only the four round corners thereof are engaged by theconnecting rod bushing: and hencewill tightly hold bushings that vary slightly in diameter.

In actual commercial usage a plurality of A arb'ors 16 having sections 1-7 of different; di1- ameters to correspond to the cranks of the different engine crank shafts will be provided for interchangeable use. Mounted on the connecting rod A is a piston B which completes the connecting rod assembly.

To test the piston B after being secured to the connecting rod by its wrist pin to determine whether or not the axis of said piston extends at right angles to the axis of the arbor 16, said piston is loosely laid on the supporting surface 6 at the base 3 so as to engage thesame throughout its entire length. The' wrist, pin connection between the connecting rod A and piston B permits said piston to be thus supported on the surface 6. The bracket 11 is then adjusted to bring the piston-aligning member 9 into a horizontal position and with its piston-engaging portion 10 in engagement with said piston in the same horizontal plane as the axis of said piston, as shown in the drawings.

Said bracket 11 can be longitudinally adjusted on the shaft 12 so that the piston-engaging portion 10 will engage pistons on connecting rods of difierentlengths. By reference to Fig. 2 it will be noted that the bracket 11 and joint 15 are provided with split bearings having set screws by which said bearings can be adjusted to compensate for wear. In case the piston B does not engage the piston engaging portion 10 at both of its ends it will be necessary to bend the connecting rod A until such contact is possible. After a piston is alignedas above described its axis will extend at right angles to the arbor 16 and hence the crank shaft to which it is to be applied.

What I claim is:

1. A machine of the kind described havat right angles to the axis of the arbor.

2. A machineof the kind described having a base with a piston-supporting surface,

. an arbor on the base, a bracket mounted on the base, and a. piston-aligning member on said bracket having a piston-engaging portion that extends in a plane parallel to the plane of said piston-supporting surface and at right angles to the axis of the arbor, said bracket being adjustable to move the pistonengaging portion of said member parallel toward or from the piston-supporting surface onthe base. j H

. 13. A. machine of the; kind described havinga base with a piston-supporting surface, an arbor on the base, a bracket mounted on the'base, and a piston-aligning member on said bracket having a piston-engaging portion-that extends in a plane parallel to the planeof said PlSiZOIhSUPPOTiZlIlg surface and at right angles .to the axis of the arbor, said bracket being adjustable to move the pistonaligning member at right angles toward or from the aXis of the arbor.

4. A machine of the kind described having a base with a pistoirsuppor ing surface,

an arbor on the base,a shaft on thebase,

ing a base with a -piston-supporting surface,

an arbor on the base, a shaft on the base, the axis of which is in a plane parallel to said piston-supporting surface, the axes of said arbor and shaft being in vertical planes that intersect each other at right angles, and a. bracket mounted on the shaft for pivotal movement and having a piston-aligning member with a piston-engaging portion that extends in aplane parallel to the plane of said piston-supporting surface and at right angles to the axis of the arbor.

6. The structure defined in claim 5 in which said bracket has a joint permitting said piston-aligning. membertobe angular-1y adjusted in respect to the piston supporting surface.

In testimony whereof WILLIAM AAB.

I affix my signature. 

